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KEF Kube12b Subwoofer


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Enquiry/price check? Click here SKU: KUBE12B
Ex VAT: £579.17

Kube12b is the flagship of KEF's Kube series of subwoofers and is the 12" alternative to the smaller 8" Kube8b and 10" Kube10b models.

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Condition: Brand new in original retail packaging

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Warranty length 5 Years
Brand KEF Speakers

Tech Specs

- Model: Kube12b
- Design: Powered Sub (sealed)
- Drive Units: 1 x 300mm (12”)
- Freq Response: 22Hz - 140Hz (-6dB)
- Maximum Output: 114dB
- Amplifier Type: Built-in Class D
- Amplifier Output Power: 300W RMS
- Variable Low Pass: 40Hz - 140Hz & LFE
- Analogue In: RCA phono/Speaker level
- Power: 100-120V / 220-240V ~50/60Hz
- Dimensions (HWD): 410 x 393 x 410mm
- Weight: 20.6kg

Product Description

KEF Kube12b Subwoofer brings deep rumble to your big living room. With a large 12" driver, the Kube12b is the largest of the family delivering a deeper bass for large rooms.

Kube Series

Stylishly designed, each totally airtight unit unbridles fiery power easily, innately and perceptively. iBX technology extends the bass depth dynamically, unlocking the full potential of the driver’s power at normal listening levels or even the most extreme.

KEF’s unique capability to design, build and integrate the driver in-house, takes optimisation to a whole new level. Delivering immersive music and home theatre sound that drives you deeper into the heart of the performance.


iBX, developed by KEF’s design and engineering team, is an Intelligent Bass Extension algorithm which creates an extended depth that unlocks the full potential of the custom driver to give you unparalleled precision and ultimate synchronicity between amplifier, driver and sealed cabinet. 

After analysing the input signal, the DSP employs KEF's iBX algorithm which enables the subwoofer to reproduce audio at louder listening levels while maintaining its dynamic quality.

Easy configuration

Kube subwoofers offer unmatched flexibility in configuration. With a range of LFE, line & speaker-level inputs, Phase selection and 3 DSP controlled EQ settings to help match your sub to any room placement, you’re in control right out of the box. The Kube can be matched to any core speaker, set up to your convenience, or with any music system so you can discover new levels in your sound.


KEF is quite possibly the only high-end manufacturer who designs, engineers and assembles the driver, cabinet and circuitry in-house. This level of integration is the hallmark of their commitment to pure sound and the Kube stays true to that ideal. What you get is a driver and amplifier so perfectly attuned they sing in absolute harmony.


After identifying whether inputs are mono or stereo, KEF's SmartConnect technology smartly tweaks the volume of the subwoofer for optimal performance. Included are placement tuning presets for Freestanding, Wall/in-cabinet and Corner meaning the Kube sounds perfect wherever it’s installed.


- Formidable 56bit 50 MIPS DSP preamplifier
- iBX Intelligent Bass Extension
- Sophisticated proprietary DSP programming
- Imposing 300W Class D amp with DSP preamp/EQ

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Contact Details

UK Local Rate Number
0844 50 403 50

Sales Landline
0121 224 7300/7401

Customer Services Landline
0121 224 7350/7351

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